2^o Alexander Pctrunkcvitch, 



The specimen is almost complete, but poorly preserved, the sur- 

 face of the rock being eroded and uneven. The specimen presents 

 only the ventral surface. It may be separated from the preced- 

 ing species by its somewhat larger size and the greater length of 

 the fourth pair of legs as compared with the first pair. Body 

 and legs are covered with long, simple hair. There are many 

 spines on all legs, apparently forming two ventral rows of three 

 spines each on all tibife and metatarsi, but the unevenness of the 

 surface makes a definite counting impossible. The spiracles are 

 not preserved, the spinnerets appear as a darker spot at the end 

 of the abdomen, but their structure or number cannot be made 

 out. The sternum is distinctly oval, longer than wide, but its 

 margin is not clear. The chelicerae are strong, their fangs are 

 not visible. The pedipalpi are both well preserved, slender and 

 short. The legs are rather rol)ust, in the order 4123. The total 

 length including chelicerse is 1 1 mm. The carapace, not showing 

 any outline of its margin, cannot be measured. The abdomen is 

 6.5 mm. long and .3 mm. wide and has more or less parallel sides. 



Measurements of the Legs in Millimeters. 



I have placed this species represented by a single specimen from 

 Florissant under the genus Segestria merely because of its exter- 

 nal similarity with the preceding species. 



2 Sub-Division Entelegyn^. 



This sub-division comprises twenty-two families of spiders in 

 which the external genital organs are more complicated. In the 

 female the genital opening is provided either with a claustrmn or 

 an epigynum. In the male the copulatory apparatus on the ter- 

 minal joint of the pedipalp is provided with variously formed 

 chitinized structures in addition to the embolus. 



To the families recognized by Simon, only few of which we 

 shall consider here, I thought it advisable to add a new family 

 Parattidse for the four species of Tertiary spiders referred to the 

 genus Parattus. 



